Update.

Author: KlausLoeffelmann

src/System.Windows.Forms/System/Windows/Forms/Controls/Buttons/ButtonInternal/DarkMode/FlatButtonDarkModeRenderer.cs

@@ -16,7 +16,7 @@ namespace System.Windows.Forms;
 /// </summary>
 internal sealed class FlatButtonDarkModeRenderer : ButtonDarkModeRendererBase
 {
-    private const int FocusIndicatorInflate = -2;
+    private const int FocusIndicatorInflate = -3;
     private const int CornerRadius = 6;
     private static readonly Size s_corner = new(CornerRadius, CornerRadius);
 
@@ -110,7 +110,7 @@ private static Color GetBorderColor(PushButtonState state) =>
         state switch
         {
             PushButtonState.Pressed => DefaultColors.PressedSingleBorderColor,
-            PushButtonState.Hot => DefaultColors.HoverBackColor,
+            PushButtonState.Hot => DefaultColors.SingleBorderColor,
             PushButtonState.Disabled => DefaultColors.DisabledBorderLightColor,
             _ => DefaultColors.SingleBorderColor,
         };